Casing for electrical condensers or other apparatus



y 1950 P. A. 'sPomNe 2,509,846

CASING FOR ELECTRICAL CONDENSERS OR OTHER APPARATUS Filed June 27, 1945Patented May 30, 1950 CASING FOR ELECTRICAL CONDENSERS OR OTHERAPPARATUS Percy Archibald Sporing, Hampton Hill, England, assignor toThe Telegraph Condenser Company Limited, North Acton, England, a Britishcom Application June 27, 1945, Serial No. 601,828 In Great Britain April12, 1944 Section 1, Public Law 690, August 8, 1946 Patent expires April12, 1964 3 Claims. 1

The present invention relates to casings for electrical condensers orother apparatus, such a casing comprising a tube open at one or bothends, and closure being effected by means of a disc inserted in the openend or in each open end, as the case may be, and retained in position byspinning over the edge of the tube, with or without the intervention ofa gasket. It is common practice to form on the tube a short distancefrom its open end or each open end, as the case may be, an internalbeading on which the closing disc rests and against which it is retainedby the spun-over edge of the tube. The disc is commonly formed toconstitute or support either a boss or the like, whereby the casing andits contents are mechanically supported, or a terminal wherebyelectrical connection to the condenser or the like is effected. Inmounting the casing by employing such means or in tightening theterminal or the like, it is commonly necessary to apply a turning forcewhich is transmitted to the disc, resulting in a tendency to rotate itrelatively to the casing. Should this occur, the eifectiveness of theclosure afiorded by the disc may be impaired, or such rotation may bedisadvantageous for other reasons, and it is the main object of thepresent invention to overcome this drawback.

According to the invention, the internal beading on the tubular casingis interrupted at one or more places so that the beading is constitutedby a corresponding number of arc-shaped portions, and there are providedon the internal surface of the end disc projections corresponding innumber, size, and location with the interruptions in the internalbeading. Thus these projections extend into the interruptions and abutagainst the ends of the arc-shaped sections of the beading so thatrotation of the disc is prevented.

In order that the invention may be clearly understood and readilycarried into effect, it will now be described more fully with referenceto the accompanying drawing which illustrates, by way of example, oneform of casing, initially open at one end only, made in accordance withthe invention and wherein:

Figure l is a, longitudinal section of the casing, and

Figure 2 is a cross section on the line 2-2.

Referring to the drawing, a rolled electrical condenser l surrounded byinsulating material 2, is contained within a casing 3 of aluminum orother suitable metal permanently closed at one end as indicated. Closureof the other end is effected by means of a, disc 4, also suitably ofaluminum, which rests on an internal beading 5 in the casing 3, beingheld in position by spinning over the open edge of the casing 3 as seenat 6. As indicated most clearly in Figure 2, the beading 5 isinterrupted so that it comprises three arcuate sections with interveningplain portions of the casing 3. Correspondingly the closing disc 4 isformed on the inside with three projections I each of which subtends anangle substantially equal to that subtended by the plain portion of thecasing lying between two sections of the beading 5. Thus opposite sidesof each projection 1 abut against sections of the beading so that, whenthe disc 4 is in position, it cannot be rotated relatively to the casing3.

The disc 4 is formed with a central external boss 8 which isscrew-threaded as indicated for the reception of one or more nuts 9whereby the completed unit may be fixed in position or to permit of itsbeing screwed into a supporting panel or the like. The boss is formedwith a central aperture [0 through which leads l I from the condenser Imay extend. After assembly of the unit, but before insertion of theclosing disc 4, the condenser I may be sealed off with a suitablecompound l2.

If desired, the sections of the heading 5 might be made to subtendunequal angles, so that the disc 4 could be inserted in one positiononly.

In the following claims, reference to the open end of the tube is to beread as applicable, not only to the open end of a tube already closed atone end, but also to each end in the case of a tube open at both ends.

What I claim and desire to secure by Letters Patent of the United Statesis:

l. A casing for electrical apparatus comprising a tube having an openend, an internal beading formed on said tube a short distance from itsopen end, said internal beading being interrupted at least at one placeso that it is constituted by a corresponding number of arc-shapedportions, a closing disk in contact with said beading, and projectionslocated on that face of said disk in contact with said beading andextending between and engaging on said arc-shaped portions.

2. In a container of the character stated, a tubular casing having atleast two inwardly directed projections on the inner wall adjacent toone end, said projections being disposed in spaced relation in a commonplane perpendicular to the length of the casing, a closing disk disposedwithin the said end of the casing between said projections and theadjacent casing end, and axially extending members carried by saidrelation in a common plant'perp'endiciilar to the 1 length of thecasing, said projections having an arcuate form directedcircumferentially of the casing, a closing disk disposed within the saidend of the casing between said projections and the adjacent casing endand engaging the projections, and axially extending members carried bysaid closing disk on the inner face thereof, each of said members beingdisposed between two projections and having a circumferential extentsubstan'tiailly-:ec1ual to thedistamce between two projections and beingof a length to engage the adjacent projections.

PERCY ARCHIBALD SPORING.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,986,339 Hartzell Jan, 1, 19352;049;671 Sprague Aug. 4, 1936 2,113,126 Baer Apr. 5, 1938 "2,244,395Hill June 3, 1941

